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Overview of Data Storage

The database server uses the following physical units to manage disk space:

Overlying the physical units of storage space, the database server supports the following logical units associated with database management:

The database server maintains the following additional disk-space storage structures to ensure physical and logical consistency of data:

Because these additional disk-space structures are not permanent storage units, they are not described in this chapter. For information about the logical log, see Logical Log. For information about the physical log, see Physical Logging. For information about reserved pages, see the disk structures and storage chapter in the IBM Informix: Administrator's Reference.

The following sections describe the various data-storage units that the database server supports and the relationships between those units.

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